fastigatum

Fastigatum is a term used in botany and horticulture to describe a plant growth habit where branches or leaves are held closely together and grow upwards, almost parallel to the main stem. This creates a narrow, upright, and columnar appearance. Plants with a fastigiate habit are often described as having a compact and architectural form, which makes them suitable for smaller gardens, tight spaces, or as vertical accents.

The fastigiate growth is typically a genetic trait, meaning it is inherited. It can occur naturally in some species, or it can be a cultivated variety that has been specifically selected or bred for this characteristic. Examples of fastigiate plants include certain cultivars of oak, maple, and cypress trees, as well as some shrubs and herbaceous plants. This growth pattern can be a result of buds being closely spaced along the stem or a tendency for branches to grow vertically rather than spreading outwards.

The term fastigiate is derived from the Latin word "fastigium," which means a gable or roof peak, referring to the pointed or upward-sweeping shape. In gardening, fastigiate plants are valued for their ability to add vertical interest without taking up excessive horizontal space. Their dense, upright structure can also provide a degree of screening or privacy. However, their narrow form may also limit their suitability for certain landscape designs where a broader spread is desired.